Starbucks announced a major change to its reward system. The coffee giant is making it a little harder to rack up Stars this summer, meaning it may take longer for rewards members to gain enough for a free drink. Starting June 24, the points received for using your own to-go reusable cup are changing, according to an email sent to rewards members.

Starbucks customers wanting to take advantage of a rewards offer will need to make larger orders if they want to maximize their benefits. Starting June 24, Starbucks Rewards members will no longer receive 25 stars if they bring in a personal, reusable cup for their beverages.

Starbucks is changing its reward for customers who bring a personal reusable cup. It could mean fewer stars for customers who order single coffees.